petscviewer: fix the fortran bindings of XXXViewFromOptions when called with obj=PETSC_NULL_XXX

PetscSF: need to initialize backends to access malloc functionality

PetscSF: the MultiSF of a MultiSF is itself

Knowing this allows to skip some expensive optimization in PetscSFSetUpPackFields
There may be other places where the knowledge of being a MultiSF can be

PetscSF: the MultiSF of a MultiSF is itself

Knowing this allows to skip some expensive optimization in PetscSFSetUpPackFields
There may be other places where the knowledge of being a MultiSF can be exploited

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Convert MPI error type to PETSc error with string message for all MPI calls

Now PETSc examples will ONLY return PETSc error codes and never MPI error codes directly so we can understand and post-pro

Convert MPI error type to PETSc error with string message for all MPI calls

Now PETSc examples will ONLY return PETSc error codes and never MPI error codes directly so we can understand and post-process their
errors better.

The test harness will now automatically retry tests that fail with MPI, this may help with Intel MPI that produces
seemingly random failures.

Commit-type: error-checking
/spend 30m

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Provide an example src/dm/tutorials/ex25.c that takes a patch from a parallel DMDA to one process

Fix DMZoomPatch() to work in 2d and and support not requesting a halo

Remove unneeded Vec argument

Provide an example src/dm/tutorials/ex25.c that takes a patch from a parallel DMDA to one process

Fix DMZoomPatch() to work in 2d and and support not requesting a halo

Remove unneeded Vec argument from DMZoonPatch()

Minor improvements to manual pages

Commit-type: bug-fix, feature, example
/spend 4h
Reported-by: Victoria Hamtiaux <victoria.hamtiaux@uclouvain.be>

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Implementation of HIP for sys and vec packages

This implements the vec functionality including tests.
In the sys level, we handle the initialization issues, but it is tested
at the vec level.

Works

Implementation of HIP for sys and vec packages

This implements the vec functionality including tests.
In the sys level, we handle the initialization issues, but it is tested
at the vec level.

Works with ROCm 3.9.

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Merge remote-tracking branch 'origin/release' into master

Merge branch 'jose/release/pgi-20.9-warnings' into 'release'

Fix warnings in NVIDIA compilers (formerly PGI)

See merge request petsc/petsc!3397

Merge remote-tracking branch 'origin/release' into master

Fix warnings in NVIDIA compilers (formerly PGI): unreachable statement

Fix PetscErrorCode typos in Fortran stubs

Add zvscat.c to makefile

Clean up vecscatter and define it as PetscSF

Pass memtypes from VecScatter to SF

Merge remote-tracking branch 'origin/maint' into master

Correct "-use_cuda_aware_mpi" to "-use_gpu_aware_mpi" in PetscSFSetFromOptions() man page.